yes i am planing on installing a neo base shower stall and i would like to know what is green board? and do i have to apply a sealer to it befor i can glue tile board to it.if so what kind of sealer.allso what size pea trap will i need to install? and allso do i need to install anything under the shower base to keep it from moveing up or down when i am standing in it? thanks a bunch.william davis